A method for individually fitting a hearing instrument to a user, comprising at least one
microphone for generating an input
audio signal from ambient sound, an
audio signal processing unit for
processing the input
audio signal into a processed output audio
signal, and a
transducer for stimulation of the
human auditory system according to the processed output audio
signal as input to said
transducer is described, the method comprising: providing the user with the hearing instrument and starting operation of the hearing instrument; pre-defining a desired target
loudness function, wherein
loudness perception of a stimulus by the user when using the hearing instrument is defined as function of frequency and input
sound pressure level at the
microphone; measuring for a given measurement parameter set of perceived
loudness levels and frequencies or frequency bands the respective
transducer input audio
signal level to be applied to the transducer input in order to achieve the respective perceived loudness level at the respective frequency or
frequency band, said measurement parameter set comprising at least a low loudness level, an intermediate loudness level and a high loudness level, and said intermediate loudness level being measured for a larger number of frequencies or frequency bands and with a finer
frequency resolution than said low and high loudness levels; calculating an individual
gain function to be implemented in the audio
signal processing unit in order to achieve the pre-defined target loudness function by taking into account the measured transducer input audio signal levels; and operating the hearing instrument with the individual
gain function.